How did Chief and Cortana end up on a split-in-half Dawn? I coulda swore that they rode the warthhog on to the In Amber Clad at the End of Halo 3 when the aft end of the ship didnt make through the portal back to Earth. Or maybe its just been that long since i last beat Halo 3... It should also be noted that i have not yet seen Forward Unto Dawn if that explains my confusion.
They made it into the cargo bay which is below and to the rear of the ship, while Arbiter ran off to the forward part of the ship. Only the front half of it made it through the portal, the end got dropped out of slip-space in some random part of the galaxy.
Its actual name is Forward Unto Dawn btw, In Amber Clad was the one in Halo 2 that got overtaken by flood.